Logo.php

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<?php
namespace Magento\Theme\Block\Html\Header;

class Logo extends \Magento\Framework\View\Element\Template
{
    protected $_template = 'Magento_Theme::html/header/logo.phtml';

    protected $_fileStorageHelper;

    public function __construct(
        \Magento\Framework\View\Element\Template\Context $context,
        \Magento\MediaStorage\Helper\File\Storage\Database $fileStorageHelper,
        array $data = []
    ) {
        $this->_fileStorageHelper = $fileStorageHelper;
        parent::__construct($context, $data);
    }

    public function isHomePage()
    {
        $currentUrl = $this->getUrl('', ['_current' => true]);
        $urlRewrite = $this->getUrl('*/*/*', ['_current' => true, '_use_rewrite' => true]);
        return $currentUrl == $urlRewrite;
    }

    public function getLogoSrc()
    {
        if (empty($this->_data['logo_src'])) {
            $this->_data['logo_src'] = $this->_getLogoUrl();
        }
        return $this->_data['logo_src'];
    }

    public function getLogoAlt()
    {
        if (empty($this->_data['logo_alt'])) {
            $this->_data['logo_alt'] = $this->_scopeConfig->getValue(
                'design/header/logo_alt',
                \Magento\Store\Model\ScopeInterface::SCOPE_STORE
            );
        }
        return $this->_data['logo_alt'];
    }

    public function getLogoWidth()
    {
        if (empty($this->_data['logo_width'])) {
            $this->_data['logo_width'] = $this->_scopeConfig->getValue(
                'design/header/logo_width',
                \Magento\Store\Model\ScopeInterface::SCOPE_STORE
            );
        }
        return (int)$this->_data['logo_width'] ? : (int)$this->getLogoImgWidth();
    }

    public function getLogoHeight()
    {
        if (empty($this->_data['logo_height'])) {
            $this->_data['logo_height'] = $this->_scopeConfig->getValue(
                'design/header/logo_height',
                \Magento\Store\Model\ScopeInterface::SCOPE_STORE
            );
        }
        return (int)$this->_data['logo_height'] ? : (int)$this->getLogoImgHeight();
    }

    protected function _getLogoUrl()
    {
        $folderName = \Magento\Config\Model\Config\Backend\Image\Logo::UPLOAD_DIR;
        $storeLogoPath = $this->_scopeConfig->getValue(
            'design/header/logo_src',
            \Magento\Store\Model\ScopeInterface::SCOPE_STORE
        );
        $path = $folderName . '/' . $storeLogoPath;
        $logoUrl = $this->_urlBuilder
                ->getBaseUrl(['_type' => \Magento\Framework\UrlInterface::URL_TYPE_MEDIA]) . $path;

        if ($storeLogoPath !== null && $this->_isFile($path)) {
            $url = $logoUrl;
        } elseif ($this->getLogoFile()) {
            $url = $this->getViewFileUrl($this->getLogoFile());
        } else {
            $url = $this->getViewFileUrl('images/logo.svg');
        }
        return $url;
    }

    protected function _isFile($filename)
    {
        if ($this->_fileStorageHelper->checkDbUsage() && !$this->getMediaDirectory()->isFile($filename)) {
            $this->_fileStorageHelper->saveFileToFilesystem($filename);
        }

        return $this->getMediaDirectory()->isFile($filename);
    }
}